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| author | Jan Beulich <jbeulich@suse.com> | 2012-12-10 11:18:25 +0100 |
|---|---|---|
| committer | Jan Beulich <jbeulich@suse.com> | 2012-12-10 11:18:25 +0100 |
| commit | e93e0d9d73ce77bd1f3471af68a194b47e0e8c45 (patch) | |
| tree | be7768d89381228bc3ed5f4867db23f631a78054 /xen/common/compat | |
| parent | edaa3f893f8f046e05099bc0d087b276a90451d4 (diff) | |
| download | xen-e93e0d9d73ce77bd1f3471af68a194b47e0e8c45.tar.gz xen-e93e0d9d73ce77bd1f3471af68a194b47e0e8c45.tar.bz2 xen-e93e0d9d73ce77bd1f3471af68a194b47e0e8c45.zip | |
streamline guest copy operations
- use the variants not validating the VA range when writing back
structures/fields to the same space that they were previously read
from
- when only a single field of a structure actually changed, copy back
just that field where possible
- consolidate copying back results in a few places
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
Diffstat (limited to 'xen/common/compat')
| -rw-r--r-- | xen/common/compat/memory.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/xen/common/compat/memory.c b/xen/common/compat/memory.c index 9e0192590d..e0fc20524c 100644 --- a/xen/common/compat/memory.c +++ b/xen/common/compat/memory.c @@ -292,8 +292,9 @@ int compat_memory_op(unsigned int cmd, XEN_GUEST_HANDLE_PARAM(void) compat) } cmp.xchg.nr_exchanged = nat.xchg->nr_exchanged; - if ( copy_field_to_guest(guest_handle_cast(compat, compat_memory_exchange_t), - &cmp.xchg, nr_exchanged) ) + if ( __copy_field_to_guest(guest_handle_cast(compat, + compat_memory_exchange_t), + &cmp.xchg, nr_exchanged) ) rc = -EFAULT; if ( rc < 0 ) |